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642 lines
15 KiB
642 lines
15 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* AD5446 SPI DAC driver |
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* |
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* Copyright 2010 Analog Devices Inc. |
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*/ |
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#include <linux/interrupt.h> |
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#include <linux/workqueue.h> |
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#include <linux/device.h> |
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#include <linux/kernel.h> |
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#include <linux/slab.h> |
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#include <linux/sysfs.h> |
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#include <linux/list.h> |
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#include <linux/spi/spi.h> |
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#include <linux/i2c.h> |
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#include <linux/regulator/consumer.h> |
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#include <linux/err.h> |
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#include <linux/module.h> |
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#include <linux/mod_devicetable.h> |
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#include <linux/iio/iio.h> |
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#include <linux/iio/sysfs.h> |
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#include <asm/unaligned.h> |
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#define MODE_PWRDWN_1k 0x1 |
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#define MODE_PWRDWN_100k 0x2 |
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#define MODE_PWRDWN_TRISTATE 0x3 |
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/** |
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* struct ad5446_state - driver instance specific data |
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* @dev: this device |
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* @chip_info: chip model specific constants, available modes etc |
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* @reg: supply regulator |
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* @vref_mv: actual reference voltage used |
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* @cached_val: store/retrieve values during power down |
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* @pwr_down_mode: power down mode (1k, 100k or tristate) |
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* @pwr_down: true if the device is in power down |
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* @lock: lock to protect the data buffer during write ops |
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*/ |
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struct ad5446_state { |
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struct device *dev; |
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const struct ad5446_chip_info *chip_info; |
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struct regulator *reg; |
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unsigned short vref_mv; |
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unsigned cached_val; |
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unsigned pwr_down_mode; |
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unsigned pwr_down; |
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struct mutex lock; |
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}; |
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/** |
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* struct ad5446_chip_info - chip specific information |
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* @channel: channel spec for the DAC |
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* @int_vref_mv: AD5620/40/60: the internal reference voltage |
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* @write: chip specific helper function to write to the register |
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*/ |
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struct ad5446_chip_info { |
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struct iio_chan_spec channel; |
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u16 int_vref_mv; |
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int (*write)(struct ad5446_state *st, unsigned val); |
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}; |
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static const char * const ad5446_powerdown_modes[] = { |
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"1kohm_to_gnd", "100kohm_to_gnd", "three_state" |
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}; |
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static int ad5446_set_powerdown_mode(struct iio_dev *indio_dev, |
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const struct iio_chan_spec *chan, unsigned int mode) |
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{ |
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struct ad5446_state *st = iio_priv(indio_dev); |
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st->pwr_down_mode = mode + 1; |
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return 0; |
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} |
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static int ad5446_get_powerdown_mode(struct iio_dev *indio_dev, |
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const struct iio_chan_spec *chan) |
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{ |
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struct ad5446_state *st = iio_priv(indio_dev); |
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return st->pwr_down_mode - 1; |
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} |
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static const struct iio_enum ad5446_powerdown_mode_enum = { |
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.items = ad5446_powerdown_modes, |
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.num_items = ARRAY_SIZE(ad5446_powerdown_modes), |
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.get = ad5446_get_powerdown_mode, |
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.set = ad5446_set_powerdown_mode, |
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}; |
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static ssize_t ad5446_read_dac_powerdown(struct iio_dev *indio_dev, |
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uintptr_t private, |
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const struct iio_chan_spec *chan, |
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char *buf) |
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{ |
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struct ad5446_state *st = iio_priv(indio_dev); |
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return sysfs_emit(buf, "%d\n", st->pwr_down); |
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} |
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static ssize_t ad5446_write_dac_powerdown(struct iio_dev *indio_dev, |
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uintptr_t private, |
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const struct iio_chan_spec *chan, |
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const char *buf, size_t len) |
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{ |
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struct ad5446_state *st = iio_priv(indio_dev); |
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unsigned int shift; |
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unsigned int val; |
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bool powerdown; |
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int ret; |
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ret = strtobool(buf, &powerdown); |
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if (ret) |
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return ret; |
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mutex_lock(&st->lock); |
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st->pwr_down = powerdown; |
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if (st->pwr_down) { |
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shift = chan->scan_type.realbits + chan->scan_type.shift; |
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val = st->pwr_down_mode << shift; |
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} else { |
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val = st->cached_val; |
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} |
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ret = st->chip_info->write(st, val); |
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mutex_unlock(&st->lock); |
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return ret ? ret : len; |
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} |
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static const struct iio_chan_spec_ext_info ad5446_ext_info_powerdown[] = { |
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{ |
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.name = "powerdown", |
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.read = ad5446_read_dac_powerdown, |
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.write = ad5446_write_dac_powerdown, |
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.shared = IIO_SEPARATE, |
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}, |
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IIO_ENUM("powerdown_mode", IIO_SEPARATE, &ad5446_powerdown_mode_enum), |
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IIO_ENUM_AVAILABLE("powerdown_mode", &ad5446_powerdown_mode_enum), |
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{ }, |
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}; |
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#define _AD5446_CHANNEL(bits, storage, _shift, ext) { \ |
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.type = IIO_VOLTAGE, \ |
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.indexed = 1, \ |
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.output = 1, \ |
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.channel = 0, \ |
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ |
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.scan_type = { \ |
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.sign = 'u', \ |
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.realbits = (bits), \ |
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.storagebits = (storage), \ |
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.shift = (_shift), \ |
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}, \ |
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.ext_info = (ext), \ |
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} |
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#define AD5446_CHANNEL(bits, storage, shift) \ |
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_AD5446_CHANNEL(bits, storage, shift, NULL) |
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#define AD5446_CHANNEL_POWERDOWN(bits, storage, shift) \ |
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_AD5446_CHANNEL(bits, storage, shift, ad5446_ext_info_powerdown) |
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static int ad5446_read_raw(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan, |
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int *val, |
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int *val2, |
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long m) |
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{ |
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struct ad5446_state *st = iio_priv(indio_dev); |
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switch (m) { |
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case IIO_CHAN_INFO_RAW: |
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*val = st->cached_val; |
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return IIO_VAL_INT; |
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case IIO_CHAN_INFO_SCALE: |
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*val = st->vref_mv; |
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*val2 = chan->scan_type.realbits; |
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return IIO_VAL_FRACTIONAL_LOG2; |
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} |
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return -EINVAL; |
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} |
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static int ad5446_write_raw(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan, |
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int val, |
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int val2, |
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long mask) |
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{ |
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struct ad5446_state *st = iio_priv(indio_dev); |
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int ret = 0; |
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switch (mask) { |
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case IIO_CHAN_INFO_RAW: |
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if (val >= (1 << chan->scan_type.realbits) || val < 0) |
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return -EINVAL; |
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val <<= chan->scan_type.shift; |
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mutex_lock(&st->lock); |
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st->cached_val = val; |
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if (!st->pwr_down) |
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ret = st->chip_info->write(st, val); |
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mutex_unlock(&st->lock); |
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break; |
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default: |
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ret = -EINVAL; |
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} |
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return ret; |
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} |
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static const struct iio_info ad5446_info = { |
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.read_raw = ad5446_read_raw, |
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.write_raw = ad5446_write_raw, |
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}; |
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static int ad5446_probe(struct device *dev, const char *name, |
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const struct ad5446_chip_info *chip_info) |
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{ |
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struct ad5446_state *st; |
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struct iio_dev *indio_dev; |
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struct regulator *reg; |
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int ret, voltage_uv = 0; |
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reg = devm_regulator_get(dev, "vcc"); |
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if (!IS_ERR(reg)) { |
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ret = regulator_enable(reg); |
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if (ret) |
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return ret; |
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ret = regulator_get_voltage(reg); |
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if (ret < 0) |
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goto error_disable_reg; |
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voltage_uv = ret; |
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} |
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indio_dev = devm_iio_device_alloc(dev, sizeof(*st)); |
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if (indio_dev == NULL) { |
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ret = -ENOMEM; |
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goto error_disable_reg; |
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} |
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st = iio_priv(indio_dev); |
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st->chip_info = chip_info; |
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dev_set_drvdata(dev, indio_dev); |
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st->reg = reg; |
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st->dev = dev; |
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indio_dev->name = name; |
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indio_dev->info = &ad5446_info; |
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indio_dev->modes = INDIO_DIRECT_MODE; |
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indio_dev->channels = &st->chip_info->channel; |
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indio_dev->num_channels = 1; |
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mutex_init(&st->lock); |
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st->pwr_down_mode = MODE_PWRDWN_1k; |
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if (st->chip_info->int_vref_mv) |
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st->vref_mv = st->chip_info->int_vref_mv; |
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else if (voltage_uv) |
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st->vref_mv = voltage_uv / 1000; |
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else |
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dev_warn(dev, "reference voltage unspecified\n"); |
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ret = iio_device_register(indio_dev); |
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if (ret) |
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goto error_disable_reg; |
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return 0; |
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error_disable_reg: |
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if (!IS_ERR(reg)) |
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regulator_disable(reg); |
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return ret; |
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} |
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static int ad5446_remove(struct device *dev) |
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{ |
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struct iio_dev *indio_dev = dev_get_drvdata(dev); |
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struct ad5446_state *st = iio_priv(indio_dev); |
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iio_device_unregister(indio_dev); |
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if (!IS_ERR(st->reg)) |
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regulator_disable(st->reg); |
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return 0; |
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} |
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#if IS_ENABLED(CONFIG_SPI_MASTER) |
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static int ad5446_write(struct ad5446_state *st, unsigned val) |
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{ |
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struct spi_device *spi = to_spi_device(st->dev); |
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__be16 data = cpu_to_be16(val); |
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return spi_write(spi, &data, sizeof(data)); |
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} |
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static int ad5660_write(struct ad5446_state *st, unsigned val) |
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{ |
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struct spi_device *spi = to_spi_device(st->dev); |
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uint8_t data[3]; |
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put_unaligned_be24(val, &data[0]); |
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return spi_write(spi, data, sizeof(data)); |
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} |
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/* |
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* ad5446_supported_spi_device_ids: |
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* The AD5620/40/60 parts are available in different fixed internal reference |
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* voltage options. The actual part numbers may look differently |
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* (and a bit cryptic), however this style is used to make clear which |
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* parts are supported here. |
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*/ |
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enum ad5446_supported_spi_device_ids { |
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ID_AD5300, |
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ID_AD5310, |
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ID_AD5320, |
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ID_AD5444, |
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ID_AD5446, |
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ID_AD5450, |
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ID_AD5451, |
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ID_AD5541A, |
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ID_AD5512A, |
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ID_AD5553, |
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ID_AD5600, |
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ID_AD5601, |
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ID_AD5611, |
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ID_AD5621, |
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ID_AD5641, |
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ID_AD5620_2500, |
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ID_AD5620_1250, |
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ID_AD5640_2500, |
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ID_AD5640_1250, |
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ID_AD5660_2500, |
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ID_AD5660_1250, |
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ID_AD5662, |
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}; |
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static const struct ad5446_chip_info ad5446_spi_chip_info[] = { |
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[ID_AD5300] = { |
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.channel = AD5446_CHANNEL_POWERDOWN(8, 16, 4), |
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.write = ad5446_write, |
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}, |
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[ID_AD5310] = { |
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.channel = AD5446_CHANNEL_POWERDOWN(10, 16, 2), |
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.write = ad5446_write, |
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}, |
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[ID_AD5320] = { |
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.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 0), |
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.write = ad5446_write, |
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}, |
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[ID_AD5444] = { |
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.channel = AD5446_CHANNEL(12, 16, 2), |
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.write = ad5446_write, |
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}, |
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[ID_AD5446] = { |
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.channel = AD5446_CHANNEL(14, 16, 0), |
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.write = ad5446_write, |
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}, |
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[ID_AD5450] = { |
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.channel = AD5446_CHANNEL(8, 16, 6), |
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.write = ad5446_write, |
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}, |
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[ID_AD5451] = { |
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.channel = AD5446_CHANNEL(10, 16, 4), |
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.write = ad5446_write, |
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}, |
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[ID_AD5541A] = { |
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.channel = AD5446_CHANNEL(16, 16, 0), |
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.write = ad5446_write, |
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}, |
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[ID_AD5512A] = { |
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.channel = AD5446_CHANNEL(12, 16, 4), |
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.write = ad5446_write, |
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}, |
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[ID_AD5553] = { |
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.channel = AD5446_CHANNEL(14, 16, 0), |
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.write = ad5446_write, |
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}, |
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[ID_AD5600] = { |
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.channel = AD5446_CHANNEL(16, 16, 0), |
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.write = ad5446_write, |
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}, |
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[ID_AD5601] = { |
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.channel = AD5446_CHANNEL_POWERDOWN(8, 16, 6), |
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.write = ad5446_write, |
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}, |
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[ID_AD5611] = { |
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.channel = AD5446_CHANNEL_POWERDOWN(10, 16, 4), |
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.write = ad5446_write, |
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}, |
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[ID_AD5621] = { |
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.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 2), |
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.write = ad5446_write, |
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}, |
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[ID_AD5641] = { |
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.channel = AD5446_CHANNEL_POWERDOWN(14, 16, 0), |
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.write = ad5446_write, |
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}, |
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[ID_AD5620_2500] = { |
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.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 2), |
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.int_vref_mv = 2500, |
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.write = ad5446_write, |
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}, |
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[ID_AD5620_1250] = { |
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.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 2), |
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.int_vref_mv = 1250, |
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.write = ad5446_write, |
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}, |
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[ID_AD5640_2500] = { |
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.channel = AD5446_CHANNEL_POWERDOWN(14, 16, 0), |
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.int_vref_mv = 2500, |
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.write = ad5446_write, |
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}, |
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[ID_AD5640_1250] = { |
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.channel = AD5446_CHANNEL_POWERDOWN(14, 16, 0), |
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.int_vref_mv = 1250, |
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.write = ad5446_write, |
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}, |
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[ID_AD5660_2500] = { |
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.channel = AD5446_CHANNEL_POWERDOWN(16, 16, 0), |
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.int_vref_mv = 2500, |
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.write = ad5660_write, |
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}, |
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[ID_AD5660_1250] = { |
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.channel = AD5446_CHANNEL_POWERDOWN(16, 16, 0), |
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.int_vref_mv = 1250, |
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.write = ad5660_write, |
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}, |
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[ID_AD5662] = { |
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.channel = AD5446_CHANNEL_POWERDOWN(16, 16, 0), |
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.write = ad5660_write, |
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}, |
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}; |
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static const struct spi_device_id ad5446_spi_ids[] = { |
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{"ad5300", ID_AD5300}, |
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{"ad5310", ID_AD5310}, |
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{"ad5320", ID_AD5320}, |
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{"ad5444", ID_AD5444}, |
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{"ad5446", ID_AD5446}, |
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{"ad5450", ID_AD5450}, |
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{"ad5451", ID_AD5451}, |
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{"ad5452", ID_AD5444}, /* ad5452 is compatible to the ad5444 */ |
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{"ad5453", ID_AD5446}, /* ad5453 is compatible to the ad5446 */ |
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{"ad5512a", ID_AD5512A}, |
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{"ad5541a", ID_AD5541A}, |
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{"ad5542a", ID_AD5541A}, /* ad5541a and ad5542a are compatible */ |
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{"ad5543", ID_AD5541A}, /* ad5541a and ad5543 are compatible */ |
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{"ad5553", ID_AD5553}, |
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{"ad5600", ID_AD5600}, |
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{"ad5601", ID_AD5601}, |
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{"ad5611", ID_AD5611}, |
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{"ad5621", ID_AD5621}, |
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{"ad5641", ID_AD5641}, |
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{"ad5620-2500", ID_AD5620_2500}, /* AD5620/40/60: */ |
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{"ad5620-1250", ID_AD5620_1250}, /* part numbers may look differently */ |
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{"ad5640-2500", ID_AD5640_2500}, |
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{"ad5640-1250", ID_AD5640_1250}, |
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{"ad5660-2500", ID_AD5660_2500}, |
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{"ad5660-1250", ID_AD5660_1250}, |
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{"ad5662", ID_AD5662}, |
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{"dac081s101", ID_AD5300}, /* compatible Texas Instruments chips */ |
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{"dac101s101", ID_AD5310}, |
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{"dac121s101", ID_AD5320}, |
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{"dac7512", ID_AD5320}, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(spi, ad5446_spi_ids); |
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static const struct of_device_id ad5446_of_ids[] = { |
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{ .compatible = "ti,dac7512" }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, ad5446_of_ids); |
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static int ad5446_spi_probe(struct spi_device *spi) |
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{ |
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const struct spi_device_id *id = spi_get_device_id(spi); |
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return ad5446_probe(&spi->dev, id->name, |
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&ad5446_spi_chip_info[id->driver_data]); |
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} |
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static int ad5446_spi_remove(struct spi_device *spi) |
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{ |
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return ad5446_remove(&spi->dev); |
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} |
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static struct spi_driver ad5446_spi_driver = { |
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.driver = { |
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.name = "ad5446", |
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.of_match_table = ad5446_of_ids, |
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}, |
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.probe = ad5446_spi_probe, |
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.remove = ad5446_spi_remove, |
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.id_table = ad5446_spi_ids, |
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}; |
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static int __init ad5446_spi_register_driver(void) |
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{ |
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return spi_register_driver(&ad5446_spi_driver); |
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} |
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static void ad5446_spi_unregister_driver(void) |
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{ |
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spi_unregister_driver(&ad5446_spi_driver); |
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} |
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#else |
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static inline int ad5446_spi_register_driver(void) { return 0; } |
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static inline void ad5446_spi_unregister_driver(void) { } |
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#endif |
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#if IS_ENABLED(CONFIG_I2C) |
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static int ad5622_write(struct ad5446_state *st, unsigned val) |
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{ |
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struct i2c_client *client = to_i2c_client(st->dev); |
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__be16 data = cpu_to_be16(val); |
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return i2c_master_send(client, (char *)&data, sizeof(data)); |
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} |
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/* |
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* ad5446_supported_i2c_device_ids: |
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* The AD5620/40/60 parts are available in different fixed internal reference |
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* voltage options. The actual part numbers may look differently |
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* (and a bit cryptic), however this style is used to make clear which |
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* parts are supported here. |
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*/ |
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enum ad5446_supported_i2c_device_ids { |
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ID_AD5602, |
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ID_AD5612, |
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ID_AD5622, |
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}; |
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static const struct ad5446_chip_info ad5446_i2c_chip_info[] = { |
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[ID_AD5602] = { |
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.channel = AD5446_CHANNEL_POWERDOWN(8, 16, 4), |
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.write = ad5622_write, |
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}, |
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[ID_AD5612] = { |
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.channel = AD5446_CHANNEL_POWERDOWN(10, 16, 2), |
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.write = ad5622_write, |
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}, |
|
[ID_AD5622] = { |
|
.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 0), |
|
.write = ad5622_write, |
|
}, |
|
}; |
|
|
|
static int ad5446_i2c_probe(struct i2c_client *i2c, |
|
const struct i2c_device_id *id) |
|
{ |
|
return ad5446_probe(&i2c->dev, id->name, |
|
&ad5446_i2c_chip_info[id->driver_data]); |
|
} |
|
|
|
static int ad5446_i2c_remove(struct i2c_client *i2c) |
|
{ |
|
return ad5446_remove(&i2c->dev); |
|
} |
|
|
|
static const struct i2c_device_id ad5446_i2c_ids[] = { |
|
{"ad5301", ID_AD5602}, |
|
{"ad5311", ID_AD5612}, |
|
{"ad5321", ID_AD5622}, |
|
{"ad5602", ID_AD5602}, |
|
{"ad5612", ID_AD5612}, |
|
{"ad5622", ID_AD5622}, |
|
{} |
|
}; |
|
MODULE_DEVICE_TABLE(i2c, ad5446_i2c_ids); |
|
|
|
static struct i2c_driver ad5446_i2c_driver = { |
|
.driver = { |
|
.name = "ad5446", |
|
}, |
|
.probe = ad5446_i2c_probe, |
|
.remove = ad5446_i2c_remove, |
|
.id_table = ad5446_i2c_ids, |
|
}; |
|
|
|
static int __init ad5446_i2c_register_driver(void) |
|
{ |
|
return i2c_add_driver(&ad5446_i2c_driver); |
|
} |
|
|
|
static void __exit ad5446_i2c_unregister_driver(void) |
|
{ |
|
i2c_del_driver(&ad5446_i2c_driver); |
|
} |
|
|
|
#else |
|
|
|
static inline int ad5446_i2c_register_driver(void) { return 0; } |
|
static inline void ad5446_i2c_unregister_driver(void) { } |
|
|
|
#endif |
|
|
|
static int __init ad5446_init(void) |
|
{ |
|
int ret; |
|
|
|
ret = ad5446_spi_register_driver(); |
|
if (ret) |
|
return ret; |
|
|
|
ret = ad5446_i2c_register_driver(); |
|
if (ret) { |
|
ad5446_spi_unregister_driver(); |
|
return ret; |
|
} |
|
|
|
return 0; |
|
} |
|
module_init(ad5446_init); |
|
|
|
static void __exit ad5446_exit(void) |
|
{ |
|
ad5446_i2c_unregister_driver(); |
|
ad5446_spi_unregister_driver(); |
|
} |
|
module_exit(ad5446_exit); |
|
|
|
MODULE_AUTHOR("Michael Hennerich <[email protected]>"); |
|
MODULE_DESCRIPTION("Analog Devices AD5444/AD5446 DAC"); |
|
MODULE_LICENSE("GPL v2");
|
|
|